I think it might be an issue with Python....i have seen so many times it lost the connection. Please try to save your code one more time by deleting your ps0.py file and run it again. I am sure this will work.

Okay, first of all, there's nothing really wrong with your code. Two minor points:
1) You don't have to use the str() function, because raw_input() returns a string as is.
2) If you want a space in between y and x when you print them, you have a couple of options. You can do "print y + ' ' + x" (no parentheses necessary" or you could do "print y,x"...if you separate by a comma, it puts a space in between that data. Or you could do "print '%s %s' % (y,x)" which formats the data for you. It's mostly a matter of taste.
So...the real question is "Why does everything disappear?". I'm going to take a guess here: you are not running your code in IDLE, you're running it by creating the file, and then looking for the file and double clicking on it. Am I right?
To run your code in IDLE, open up IDLE, open up the file, and then hit F5. It will run in the IDLE window. If you really want to be able to double click on your file and not have it close immediately as soon as it's done running (this is a perfectly reasonable thing to want to do), then you can fix this by simply adding another raw_input() function as the very last line of your code. Then your code will wait for you to press Enter before it closes.